I actually emailed coachmen about it. Here is the response:
The seal is cut away at the rollers to prevent the seal from contacting the rollers and tearing them as the room cycles in and out. You will also see the seal cut away at the arm which operates the arm mechanism and again, this is done to allow the arm to cycle in and out without damage to the seal. We hope this answers your question as to why the seals are cut away.
We do not have a modification that eliminates this issue, if modifications are made, you would want to insure that that interference with the rollers and arm is avoided.